Clutch

ABSTRACT

In a spring loaded cam type clutch having a driving and driven member, the improvement for providing two-way drive by providing a reversing pin connected to one of the members and a spring loaded pawl pivotally mounted on the second member for bypassing the reversing pin in the forward direction, but engaging the reversing pin and driving the driven member in the reverse direction.

United States Patent Moran June 27, 1972 [541 CLUTCH [56] ReferencesCited UNITED STATES PATENTS [72] Inventor: John J. Moran, Houston, Tex.

2,140,737 12/1938 Dickens.... ..192/27 1 Assignee= flycel, Houston,2,634,121 4/1953 Peters et al.. 192/27 x 2,644,560 7 1953 Kleinschmidt192/44 x [22] Filed: June 21,1971

[2]] Appl.No.: 154,988

Related US. Application Data [62] Division of Ser. No. 737,065, June 14,1968, Pat. No.

[52] US. Cl ..192/27, 192/38, 192/44 [51] lnt.Cl..Fl6d41/02,Fl6d4l/07,Fl6d4l/O8 [58] Field ofSearch ..192/27, 38,44, 45

Primary Examiner-A1lan D. Herrmann Attorney-James F. Weiler et a1.

[57] ABSTRACT In a spring loaded cam type clutch having a driving anddriven member, the improvement for providing two-way drive by providinga reversing pin connected to one of the members and a spring loaded pawlpivotally mounted on the second member for bypassing the reversing pinin the forward direction, but engaging the reversing pin and driving thedriven member in the reverse direction.

1 Claim, 4 Drawing Figures PATENTEDJUHN 1972 3,672,477

z/Zafin Moro/7 INVENTOR.

BY Z i fw ATTORNEVJ CLUTCH CROSS-REFERENCES TO RELATED APPLICATIONS Thisapplication is a divisional application of co-pending Pat. applicationSer. No. 737,065 filed June 14, 1968, now U.S. Pat. No. 3,622,279,entitled Automatic Chemical Testing Apparatus.

BACKGROUND OF THE INVENTION In a conventional spring loaded cam clutchthe clutch will provide a drive or a disconnect in a single rotationaldirection. The present invention is directed to an improvement to such aclutch which will provide drive in a reverse rotational direction. I

SUMMARY The present invention is directed to an improvement in a springactuated cam clutch of a spring loaded pawl pivotally mounted on one ofthe driving and driven members and a reversing pin connected to theother of said members whereby the pawl will ratchet by the pin in onedirection, but engages the pin in a second direction to provide areverse drive whereby the clutch may be actuated for a driving movementin either rotational direction.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a fragmentary elevationalview, partly in cross section, illustrating the two-way clutch assemblyof the present invention,

FIG. 2 is a view taken along the line 2-2 of FIG. 1,

FIG. 3 is a view taken along the line 33 of FIG. I, and

FIG. 4 is a view taken along the line 4-4 of FIG. 3.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawings,the reference numeral 114 generally refers to the clutch of the presentinvention which is positioned between a driving shaft and a drivenshaft, wherein shaft 422 is the driving shaft and shaft 420 is thedriven shaft.

As is conventionalin a spring loaded cam clutchthe driven shaft 420 inclutch roller case member 421 is connected by the action of a cam member424 having cam surfaces 426 thereon which are adapted to engage clutchrollers 428 and cause them to engage a driving member housing 430 whichin turn is connected to the driving shaft 422. Member 430 includesmember 431 fixedly secured thereto and which rotates with member 430.Springs 432 are connected between the driven roller case member 421 andthe cam member 424 for causing the cam member 424 to engage the clutchrollers 428 and cause them to engage the driving housing member 430.Thus, one end of springs 432 is connected to pins 437 on member 421 andthe second end of springs 432 is connected to pins 439 on member 434.However, this conventional clutch operation will operate to drive in asingle rotational direction of the drive shaft 422 and provide adisconnect in the reverse direction. The direction of drive isdetermined by the direction the springs 432 are connected between thedriven housing 421 and the cam member 424.

A forward indexing pin 442 and external stop means such as a solenoid444 having an actuating lever 446 (FIG. 2) is pro vided. When solenoid446 is deenergized, the actuating lever 446 is yieldably urged by spring447 into engagement with the forwarding indexing pin 442 and stops thedriven shaft 420 and expands the springs 432 thereby releasing theinternal bearings 428. Thus, the drive shaft 422 continuously turns, butis disconnected from the driven shaft 420. However, when solenoid 444 isenergized, the actuating lever 446 moves out ing shaft 422 and thedriven shaft 420. A reversing pawl 434 is provided pivotally mounted bypin 440 onmember 431 and is yieldably urged against a stop pin 436 by aspring 435. One end of spring 435 is positioned against pin 436 and theother end of spring 435 is connected to pawl 435. A reverse pin 438 ismounted on roller case member 421 and protrudes so as to engage the endof the pawl 434. When the driving shaft 422 is being drivenconventionally, and the rollers 428 are engaging the driving housingmember 430 the clutch will be conventionally engaged and there will beno interaction between the pawl 434 and the reversing pin 438. That is,when the driving shaft 422 is turned in a counterclockwise direction423, the driven shaft 420 turns conventionally as the springs 432contract and engage the internal rollers 428 in the clutch. However,when the solenoid 444 is deenergized to move the actuating lever 446into position engaging forward indexing pin 442 disengaging the rollers428 from the housing 430 and releases the driven shaft 420 from thedriving shaft 422. While the drive shaft 422 continues to turn, thespring loaded pawl 434 ratchets past the reversing pin 438. Thus, thedriven shaft 420 remains disconnected and will only turn when theforward indexing pin 422 is released by the actuating lever 446 onenergization of solenoid 444.

However, when the drive shaft 422 is driven in a clockwise direction425, the pawl 434 engages reverse pin 438 thereby causing the drivenshaft 420 to begin to turn clockwise. Thus, the improved clutch 114 ofthe present invention may be simply actuated in either direction ofrotation of the drive shaft 420.

The present invention, therefore, is well adapted to carry out theobjects and attain the ends and advantages mentioned as well as othersinherent therein. While a presently preferred embodiment of theinvention is given for the purpose of disclosure, numerous changes inthe details of construction and arrangement of parts will readilysuggest themselves to those 7 skilled in the artand are encompassedwithin the spirit of the invention and the scope of the appended claims.

What is claimed is:

I. In combination with a clutch having a driving member, a driven memberhaving a cam and roller case member, rollers carried by the drivenmember between the 'cam and roller case member, a spring between the camand roller case member urging said rollers into engagement with thedriving member in one rotational direction thereby providing engagementof said clutch as said driving member is driven in said one direction,but providing disengagement of the rollers as the driving member isdriven in the other rotational direction and overcomes said spring, anindexing pinconnected to the driven member roller case member, stopmeans positioned to engage said indexing pin for releasing said rollersand disconnecting said clutch in said second direction, of a two-waydrive comprising,

a spring loaded pawl pivotally mounted on said driving member and withone end extending adjacent the driven member,

a stop pin holding said one end against movement in said seconddirection, but allowing movement of said one end in the first direction,and

a reversing pin connected to the driven member, and positioned to engagesaid pawl one end.

I t i 0

1. In combination with a clutch having a driving member, a driven memberhaving a cam and roller case member, rollers carried by the drivenmember between the cam and roller case member, a spring between the camand roller case member urging said rollers into engagement with thedriving member in one rotational direction thereby providing engagementof said clutch as said driving member is driven in said one direction,but providing disengagement of the rollers as the driving member isdriven in the other rotational direction and overcomes said spring, anindexing pin connected to the driven member roller case member, stopmeans positioned to engage said indexing pin for releasing said rollersand disconnecting said clutch in said second direction, of a two-waydrive comprising, a spring loaded pawl pivotally mounted on said drivingmember and with one end extending adjacent the driven member, a stop pinholding said one end against movement in said second direction, butallowing movement of said one end in the first direction, and areversing pin connected to the driven member, and positioned to engagesaid pawl one end.